JP5892633B1 - Caster attaching / detaching structure and cart equipped with the same - Google Patents

Abstract

[PROBLEMS] To eliminate as much as possible the mounting and dismounting of a pedestal of a caster with respect to the main body of the carriage without the need to attach or remove the restricting member for restricting the movement of the pedestal attached to the main body of the carriage to the main body of the carriage. Provision of a caster attachment / detachment structure that can be simplified. SOLUTION: A pair of pedestal insertion portions 11a1 and 11a2 into which end portions 21a and 21b of a pedestal 21 of a caster 20 provided on a lower surface of a main body portion 11 of a cart 10 can be fitted, and insertion of a pedestal fitted into the pedestal insertion portion. A first pedestal abutting portion 11b that abuts against the end portion 21c at the front end of the direction, and is movably mounted in the vertical direction with respect to the main body portion, is fitted into the pedestal fitting portion, and is attached to the first pedestal abutting portion. When the lower surface of the main body part faces downward with respect to the pedestal where the end of the side of the insertion direction tip is in contact, the lower surface of the main body part moves to a position that restricts movement in the direction opposite to the insertion direction of the pedestal. A base mounting state fixing / releasing member 11c that moves to a position where the restriction is released when facing upward is provided. [Selection] Figure 1

Description

  The present invention relates to a caster attachment / detachment structure in which a caster with a pedestal can be attached / detached without using bolts or the like in a main body of the carriage, and a carriage including the same.

There are types of carts such as silver cars and shopping carts in which a caster with a base is attached to the main body of the cart.
The base of the caster with pedestal is provided with holes through which bolts, screws, rivets, etc. pass, and the bolts, etc. are inserted from the holes provided in the pedestal, and nuts etc. are interposed in the bolts, so It is generally known in the art to attach to the main body of the carriage.

  By the way, in a bogie, the wear of a built-in caster in order to make the direction of a wheel free in the case where the worn caster is equipped with aged caster or the mounted caster is a free caster is caused by the use over time. The caster needs to be replaced.

  However, attaching a caster with a pedestal to the main body of the carriage using bolts and nuts, for example, complicates the installation and removal work for replacing the caster.

  For this reason, in the main-body part of a trolley | bogie, the attachment / detachment structure of the caster which can attach / detach the caster with a base without using a volt | bolt etc. is calculated | required.

  Conventionally, as this type of caster attachment / detachment structure, the caster pedestal is fitted into the mounting portion provided on the lower surface side of the main body of the carriage, and the fixing member is fitted into the gap between the pedestal and the main body, For example, the following Patent Documents 1 to 3 disclose a configuration in which a caster is attached in a fixed state so as not to come out of the main body.

  The caster attaching / detaching structure described in Patent Document 1, for example, as shown in FIG. 9, includes left and right side walls 52a, 52b and front and rear side walls 52c, 52d formed by ribs protruding downward from the lower surface of the loading platform 51. The rectangular frame portion 52 formed by the above and the front and rear bottom plate portions 53 and 54 formed at the front and rear of the space surrounded by the lower end of the frame portion 52, and formed above the internal space. The upper plate 55 is provided with an opening (not shown in FIG. 9) provided on the upper surface of the loading platform 51, and a stopper 58 and a pressing piece 59 for strongly fitting to the opening, respectively. It is configured with. A plurality of low ridges (not shown in FIG. 9) on the upper surface of the front bottom plate portion 53, a plurality of low ridges (not shown in FIG. 9) on the upper surface of the rear bottom plate portion 54, an upper plate A plurality of support ribs 55a are formed on the lower surface of the portion 55 at equal intervals in the front-rear direction. The stopper 58 includes an upper plate, a side wall 58a on all sides, a protruding portion 58b that is formed on the inner side of the side wall 58a so as to protrude to a height that is about the plate thickness of the pedestal 61, and an engagement protrusion that is formed on the side wall 58a. It has a portion 58c. Engagement recesses (not shown in FIG. 9) with which the engagement projections 58c engage are formed at corresponding portions of the side walls 52a, 52c, and 52d of the loading platform 51. The pressing piece 59 has an upper plate, side walls 59a in four directions, and engaging protrusions 59b of horizontal stripes formed on the side walls 59a. Engagement recesses (not shown in FIG. 9) with which the engagement projections 59b engage are formed at corresponding portions of the side walls 52b, 52c, and 52d of the loading platform 51.

  In the caster attaching / detaching structure described in Patent Document 1, when the caster 60 is attached to the loading platform 51, first, the caster 60 is tilted so that the one end portion 61a of the pedestal 61 is slanted into the rear bottom plate portion 54 and the side wall. The pedestal 61 is brought into intimate contact with the support rib 55a until it abuts against 52d, and the other end 61b facing the one end 61a of the pedestal 61 is prevented from interfering with the front bottom plate 53. Next, the upper surface of the pedestal 61 is brought into contact with the support rib 55a, and the other end portion 61b of the pedestal 61 is fitted while crushing the protrusion provided on the upper surface of the front bottom plate portion 53, and the one end portion 61a is By moving the protrusion provided on the upper surface of the rear bottom plate portion 54 while squeezing it, it moves to a predetermined fixing position, and the pedestal 61 is held in a strong pressure state by the support rib 55a, the front bottom plate portion 53, and the rear bottom plate portion 54. To be. Next, from the upper surface of the loading platform 51, a stopper 58 is inserted into the opening 56, and a pressing side 59 is inserted into the opening 57, and the engaging convex portion 58c and the engaging convex portion 59c are engaged with the corresponding engaging concave portions, respectively. Let Accordingly, the side wall end surface 58a of the stopper 58 presses the upper surface of the one end portion 61a of the pedestal 61, and the pedestal 61 is moved rearward at a position where the protruding portion 58b of the stopper 58 can come into contact with the other end portion 61b of the pedestal 61. In order to prevent this, the caster 60 is fixedly attached to the loading platform 51.

  Further, as shown in FIG. 10, for example, the caster attaching / detaching structure described in Patent Document 2 includes an upper surface of a caster base fixing support 71 formed on the carriage main body 70 and a lower end of the in-caster attachment portion connecting rib 72. After inserting one side part 81a of the side parts 81a and 81b of the pedestal 81 of the caster 80 into the gap formed therebetween, the fitting block mounting space part 82 formed on the back side of the cart body 70 While fitting the fitting block portion 73 ′ of the caster base mounting support block 73, the horizontal locking projection 73a1 ′ protruding from the elastic piece formed on the side wall 73a ′ of the fitting block portion 73 ′ is provided. It is fitted and locked to the outer locking through hole 74a formed in the short side facing partition rib 74 constituting the caster mounting portion formed on the back side of the cart body 70, and the fitting block 73 ' Elastic piece formed The locking projection 73b1 ′ protruding from the side wall 73b ′ opposite to the side wall 73a ′ is fitted into the inner locking through hole (not shown in FIG. 10) drilled in the in-caster mounting portion connecting rib 72. The other side 81b of the side portions 81a and 81b of the pedestal 81 of the caster 80 is supported from below by the caster pedestal support plate 73 ″ of the caster pedestal mounting support block 73 by being locked together. Has been.

  Further, the caster attaching / detaching structure described in Patent Document 3 is, for example, as shown in FIG. 11, a sandwiching portion 92 (support surface 92 a, sandwiching) that sandwiches the three sides of the base 101 of the caster 100 on the back surface of the table 90. The surface 92b and the rib 92c) are provided, and after inserting the three sides of the pedestal 101 of the caster 100 into the clamping portion 92, the stopper 93 is inserted into the remaining one side portion from the insertion hole 94 on the surface side of the table 90, and the engagement protrusion 93a is engaged with the lower surface of the base 101 to fix the caster 100 at a predetermined position.

JP 2006-21555 A Japanese Patent No. 5238601 Japanese Patent Laid-Open No. 11-20706

However, in any of the caster attachment / detachment structures described in Patent Documents 1 to 3, when the pedestal of the caster is attached to the main body of the cart, the caster attached to the main body of the cart moves in the pull-out direction. It is necessary for the user to manually insert the regulating members (the stopper 58 in FIG. 9, the pressing piece 59, the caster base mounting support block 73 in FIG. 10, and the stopper 93 in FIG. 11) for regulating the main body of the carriage. There is. Moreover, when removing the base of a caster from the main-body part of a trolley | bogie, it is necessary for a user to remove the said limitation member from the main-body part of a trolley | bogie by hand. And since the said control member with which the attachment or detachment structure of the caster of patent documents 1-3 is equipped with the main-body part of a trolley | bogie so that it may not remove | deviate from the main-body part of a trolley | bogie, The operation to remove from is not easy.
Further, the restriction member provided in the caster attaching / detaching structure described in Patent Documents 1 to 3 is separated from the main body of the carriage by removing the caster from the main body of the carriage when the caster is removed from the main body of the carriage. It becomes. For this reason, it is necessary for a person who attaches or detaches the caster to pay attention so as not to lose the regulating member removed from the main body of the carriage.
As described above, the caster attaching / detaching structures described in Patent Documents 1 to 3 are for restricting movement of the pedestal attached to the main body of the cart in the pull-out direction when the caster is attached to and detached from the main body of the cart. The restriction member needs to be attached to and detached from the main body of the carriage, and there is a problem that the operation becomes complicated accordingly.

  The present invention has been made in view of the above-described conventional problems, and it is not necessary to attach or remove the regulating member for regulating the movement of the pedestal attached to the main body of the carriage in the pull-out direction to the main body of the carriage. Thus, it is an object of the present invention to provide a caster attaching / detaching structure and a carriage provided with the caster attaching / detaching structure capable of simplifying the attaching / detaching operation of the caster base with respect to the main body of the carriage as much as possible.

In order to achieve the above object, a caster attaching / detaching structure according to the present invention is a caster attaching / detaching structure for attaching / detaching a caster with a pedestal to a main body portion of a carriage, and is provided on a lower surface of the main body portion. A pair of pedestal insertion portions capable of inserting two side ends of the pedestal; and an end portion of the side of the tip of the caster in the insertion direction provided on the lower surface of the main body portion and inserted into the pair of pedestal insertion portions; A first pedestal abutting portion that abuts, and is attached to the main body portion so as to be movable in accordance with gravity in the vertical direction so as not to be detached from the main body portion by moving in the vertical direction, and is fitted into the pair of pedestal insertion portions. And, when the lower surface of the main body of the carriage is in a state of facing downward with respect to the pedestal of the caster in which the end of the side of the insertion direction tip contacts the first pedestal contact part, Caster From insertion direction front side of the seat and fitting direction of the base of the caster to move by gravity to a position for restricting movement in the opposite direction, in a state in which the lower surface of the main body portion of the truck facing upward, said caster The base mounting state fixing / releasing member moves according to gravity at a position where the restriction of the movement of the caster in the direction opposite to the insertion direction of the base from the front side in the insertion direction of the caster is released.

  Further, in the caster attaching / detaching structure of the present invention, the pedestal mounting state fixing / releasing member is provided in a loosely fitting portion that is loosely fitted in a penetrating portion that penetrates the main body portion of the carriage, and at one end of the loosely fitting portion. And when the lower surface of the main body of the carriage is in a state of facing downward, the first main body abutting portion that abuts on the upper surface of the main body of the cart, and the first fitting portion in the loose fitting portion A second body portion abutting against the lower surface of the main body portion of the carriage when the lower surface of the main body portion of the carriage is in a state of being directed upward. And when the lower surface of the main body portion of the carriage is in a state of facing downward, the pair of pedestal insertion portions, and the first pedestal support The end of the side of the tip in the insertion direction is in contact with the contact portion, and the front side in the insertion direction in the base of the caster Retreating to a position that does not contact the end of the side of the caster base on the near side in the insertion direction when the lower surface of the main body of the cart is facing upward. It is preferable to have a base contact part.

  Moreover, in the caster attachment / detachment structure of the present invention, the loose fitting portion has a columnar portion on the other end side relative to the first main body portion abutting portion, and the second main body portion abutting portion is the columnar portion. It is preferable that the second pedestal contact portion is formed of a side surface of the cylindrical portion.

  In the caster attaching / detaching structure of the present invention, it is preferable that the second pedestal contact portion is formed in a rod shape.

  In the caster attaching / detaching structure of the present invention, it is preferable that the second pedestal contact portion is formed in a plate shape.

  Moreover, the cart according to the present invention is characterized by including the caster attaching / detaching structure according to any one of the present invention.

  According to the present invention, it is not necessary to attach and remove the restricting member for restricting the movement of the pedestal attached to the main body of the cart in the pull-out direction to the main body of the cart, and the caster base with respect to the main body of the cart. A caster attaching / detaching structure and a carriage equipped with the same can be obtained.

It is the perspective view which looked at the trolley | bogie provided with the caster attachment / detachment structure concerning 1st Embodiment of this invention from diagonally upward. It is a side view of the main-body part vicinity of the trolley | bogie of FIG. It is a figure which shows the principal part structure of the main-body part of a trolley | bogie provided with the caster attachment / detachment structure shown in FIG. 1, (a) is a side view of the main part vicinity of the main-body part of a trolley, (b) shows the principal part in (a). FIG. 2 is a partial cross-sectional view, (c) is a bottom view near the main part of the main body of the carriage, and (d) is a top view near the main part of the main body of the carriage. It is explanatory drawing which shows the procedure when attaching the caster with a base to the cart provided with the caster attaching / detaching structure of 1st Embodiment, and the operation state of the principal part of a caster attaching / detaching structure, (a) is the caster with a base in the main-body part of a cart. The figure which shows the initial state which is not attached, (b) is the figure which shows the state which reversed the main-body part of the cart from the state of (a), (c) is the cart in the state of (b) (D) is a view showing a state in which the upper and lower sides of the main body of the cart in the state of (c) are returned to the original state. It is a figure which shows the principal part structure of the main-body part of the trolley | bogie provided with the caster attachment / detachment structure concerning 2nd Embodiment of this invention, (a) is a side view of the principal part vicinity of a trolley | bogie main part, (b) is (a) FIG. 4C is a partial cross-sectional view of the main part of FIG. 2C, FIG. 3C is a bottom view of the main part of the main body of the carriage, and FIG. It is explanatory drawing which shows the procedure at the time of attaching a caster with a base to the cart provided with the caster attachment / detachment structure of 2nd Embodiment, and the operation state of the principal part of a caster attachment / detachment structure, (a) is a caster with a base in the main-body part of a cart. The figure which shows the initial state which is not attached, (b) is the figure which shows the state which reversed the main-body part of the cart from the state of (a), (c) is the cart in the state of (b) (D) is a view showing a state in which the upper and lower sides of the main body of the cart in the state of (c) are returned to the original state. It is a figure which shows the principal part structure of the trolley | bogie provided with the caster attaching / detaching structure concerning 2nd Embodiment of this invention, (a) is a side view of the principal part vicinity of the main-body part of a trolley | bogie, (b) is the important point in (a). The figure which shows a part in a cross section, (c) is the bottom view of the principal part vicinity of the main-body part of a trolley | bogie, (d) is the top view near the principal part of the main-body part of a trolley | bogie. It is explanatory drawing which shows the procedure at the time of attaching a caster with a base to the cart provided with the caster attachment / detachment structure of 2nd Embodiment, and the operation state of the principal part of a caster attachment / detachment structure, (a) is a caster with a base in the main-body part of a cart. The figure which shows the initial state which is not attached, (b) is the figure which shows the state which reversed the main-body part of the cart from the state of (a), (c) is the cart in the state of (b) (D) is a view showing a state in which the upper and lower sides of the main body of the cart in the state of (c) are returned to the original state. It is a principal part disassembled perspective view of the caster attachment / detachment structure concerning one prior art example. It is principal part sectional drawing of the caster attachment / detachment structure concerning another prior art example. FIG. 6 is a diagram showing a configuration of a caster attaching / detaching structure according to still another conventional example, in which (a) is a sectional view of a principal part viewed from the side, and (b) is a sectional view of a principal part viewed from the front.

Prior to the description of the embodiment, the function and effect of the present invention will be described.
The caster attaching / detaching structure of the present invention is a caster attaching / detaching structure for attaching / detaching a caster with a pedestal to a main body portion of a carriage, and is provided on a lower surface of the main body portion, and is fitted with two end portions of the caster base. A pair of possible pedestal insertion portions, and a first pedestal contact portion that is provided on the lower surface of the main body portion and abuts against the end portion of the tip in the insertion direction of the pedestal of the caster that is inserted into the pair of pedestal insertion portions. And attached to the main body part so as to be movable in accordance with gravity in the vertical direction and not to be detached from the main body part by moving in the vertical direction, and fitted into the pair of base insertion parts, and the first base When the lower surface of the main body of the cart is directed downward with respect to the caster base in which the end portion of the tip in the insertion direction is in contact with the contact portion, from the front side in the insertion direction on the caster base. The The insertion direction of Yasuta pedestal moved by gravity to a position for restricting movement in the opposite direction, in a state in which the lower surface of the main body portion of the truck facing upward from insertion direction front side of the pedestal of the caster There is a pedestal mounting state fixing / releasing member that moves according to gravity at a position where the restriction of the movement of the caster in the direction opposite to the insertion direction of the pedestal is released.

  Like the caster attachment / detachment structure of the present invention, a pair of pedestal insertion portions that are provided on the lower surface of the main body portion of the carriage and can be fitted with two end portions of the pedestal of the casters, and provided on the lower surface of the main body portion, The caster with a base can be easily attached to and detached from the main body of the carriage without using bolts or the like if the first base abutting portion that abuts the end of the side of the tip of the caster fitted in the portion in the fitting direction is provided. .

Then, like the caster attaching / detaching structure of the present invention, it is attached to the main body part of the carriage so as to be movable in accordance with gravity in the vertical direction and not to be detached from the main body part by moving in the vertical direction. When the lower surface of the main body of the carriage is facing downward with respect to the pedestal of the caster that is inserted and the end of the side of the insertion direction tip is in contact with the first pedestal contact part, the pedestal of the caster When the caster pedestal is moved according to gravity from the front side of the caster to the position that restricts the movement of the caster base in the direction opposite to the fit direction, and the bottom surface of the main body of the cart is facing upward, if the insertion direction of the caster of the pedestal from the insertion direction front side it has a pedestal mounted state fixing and releasing member which moves by gravity to a position for releasing the restriction of the movement in the opposite direction, a removable caster Controls the movement of the pedestal attached to the main body of the cart in the pull-out direction when the caster is attached to and detached from the main body of the cart as in the conventional caster attaching / detaching structure described in Patent Documents 1 to 3. Therefore, it becomes unnecessary to attach and remove the regulating member to the main body of the carriage.
Moreover, as in the caster attaching / detaching structure of the present invention, the base mounting state fixing / releasing member is attached to the main body portion of the carriage so as to be movable in accordance with gravity in the vertical direction and not to be detached from the main body portion by moving in the vertical direction. If the caster is removed from the main body of the carriage, such as the restriction member provided in the caster attachment / detachment structure described in Patent Documents 1 to 3 described above, the carriage is removed from the main body of the carriage. Therefore, the caster detacher does not need to pay attention not to lose the regulating member.
As a result, according to the caster attaching / detaching structure of the present invention, it is not necessary to attach and remove the restricting member for restricting the movement of the pedestal attached to the main body of the carriage in the pull-out direction to the main body of the carriage. In addition, it is possible to simplify the attaching / detaching operation of the caster base with respect to the main body of the carriage as much as possible.

Further, in the caster attaching / detaching structure of the present invention, preferably, the base mounting state fixing / releasing member includes a loosely fitting portion loosely fitted in a penetrating portion penetrating the main body portion of the carriage, and one end of the loosely fitting portion. And when the lower surface of the main body portion of the carriage is facing downward, the first main body portion abutting portion that abuts on the upper surface of the main body portion of the carriage, and the loose fitting portion A second body that is provided on the other end side of the first main body portion abutting portion and is in contact with the lower surface of the main body portion of the cart when the lower surface of the main body portion of the cart is facing upward. The main body abutting portion and the loose fitting portion are connected to each other, and when the lower surface of the main body portion of the carriage faces downward, the pair of pedestal fitting portions are fitted, and the first Insertion in the pedestal of the caster, with the end of the side in the insertion direction in contact with the base contact portion of the caster Close to the end of the front side and when the lower surface of the main body of the carriage is facing upward, it is not in contact with the end of the front side of the caster base. A second pedestal abutting portion for retreating;
In this way, in the present invention, there is no need to attach and remove the regulating member for regulating the movement of the base attached to the main body of the carriage in the pull-out direction to the main body of the carriage, and the main body of the carriage. The effect of simplifying the mounting and dismounting operation of the caster base with respect to the can is realized.

In the caster attachment / detachment structure of the present invention, preferably, the loose fitting portion has a cylindrical portion on the other end side of the first main body portion contact portion, and the second main body portion contact portion is The second cylindrical contact portion is formed of a side surface of the cylindrical portion, and is formed of a surface of the cylindrical portion on the main body portion side.
In the caster attachment / detachment structure of the present invention, preferably, the second pedestal contact portion is formed in a rod shape.
If it does in this way, a base mounting state fixing / release member can be reduced in size, and the attachment or detachment space to the main-body part of a trolley | bogie can be suppressed.

Moreover, in the caster attaching / detaching structure of the present invention, preferably, the second pedestal contact portion is formed in a plate shape.
In this way, the second pedestal abutting portion can come into contact with the end of the side on the near side in the insertion direction of the pedestal mounted on the main body portion of the carriage, so that the second base abutting portion can be attached to the main body portion of the carriage. The movement of the pedestal in the exit direction can be more reliably regulated.

Moreover, the trolley | bogie by this invention is equipped with the caster attachment / detachment structure in any one of the said invention.
In this way, it is not necessary to attach or remove the restricting member for restricting movement of the pedestal attached to the main body of the cart in the pull-out direction to the main body of the cart, and the caster pedestal with respect to the main body of the cart. Thus, a cart capable of simplifying the attaching / detaching operation as much as possible can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First Embodiment FIG. 1 is a perspective view of a cart provided with a caster attaching / detaching structure according to a first embodiment of the present invention as viewed obliquely from above. FIG. 2 is a side view of the vicinity of the main body of the carriage of FIG. FIG. 3 is a view showing the configuration of the main part of the main body of the carriage provided with the caster attaching / detaching structure shown in FIG. 1, (a) is a side view of the main part of the main body of the truck, and (b) is the same as (a). The figure which shows a principal part in a cross section, (c) is a bottom view of the principal part vicinity of the main-body part of a trolley | bogie, (d) is a top view of the principal part vicinity of the main-body part of a trolley | bogie. FIG. 4 is an explanatory view showing a procedure for attaching a caster with a pedestal to the cart provided with the caster attaching / detaching structure of the first embodiment and an operating state of the main part of the caster attaching / detaching structure. The figure which shows the initial state where the casters with pedestals are not installed, (b) is the figure which shows the state where the top and bottom of the main body of the carriage is inverted from the state of (a), (c) is the state of (b) (D) is a diagram showing a state in which the top and bottom of the main body of the cart in the state of (c) are returned to the original state.

  As shown in FIGS. 1 and 2, the cart 10 of the first embodiment is configured so that four casters 20 with pedestals can be attached to and detached from the four corners A, B, C, and D of the main body 11. In FIG. 1, 12 is a gripping part, and 22 is a wheel provided on a caster 20 with a base. In addition, the following description shall perform about the structure of the caster attaching / detaching structure which can attach or detach the caster 20 with a base in one corner of the main-body part 11 for convenience. Moreover, in each following embodiment, the caster 20 with a base shall use the free caster which can change the direction of a wheel freely.

As shown in FIG. 3B, the main body 11 of the carriage 10 includes a pair of base insertion portions 11a1 and 11a2, a first base contact portion 11b, and a base mounting state fixing / release member 11c. Yes.
A pair of pedestals fitting portion 11a1,11a2 is provided on the lower surface of the main body portion 11, a lower face supporting portion 11 a 1 _1, 11a2 _1, is composed of a top abutment 11a0,11a1 _2, 11a2 _2.
The lower surface support portions 11a1 ₁ and 11a2 ₁ extend along the direction in which the casters 20 are inserted, and the cross section is formed in a substantially L shape and a shape in which the left and right sides of the substantially L shape are turned over. The lower surface of 21 is supported.
The upper surface abutting portion 11a0 is formed in a plate shape extending in a direction perpendicular to the insertion direction of the casters 20, and the lower edge abuts on the upper surface of the base 21 of the inserted casters 20.
The upper surface abutting portions 11a1 ₂ and 11a2 ₂ are formed in a plate shape extending along the insertion direction of the caster 20, and the lower edge abuts on the upper surface of the base 21 of the caster 20 inserted.
The pair of pedestal insertion portions 11a1 and 11a2 can be inserted into two opposite end portions 21a and 21b of the pedestal 21 of the caster 20.
The first pedestal contact portion 11b is provided on the lower surface of the main body portion 11, extends in a direction perpendicular to the insertion direction of the caster 20, and is a pedestal 21 of the caster 20 that is fitted into the pair of pedestal insertion portions 11a1 and 11a2. Is formed so as to be in contact with the end portion 21c at the end of the insertion direction.

  In addition, on the side surface of the main body portion 11 on the side where the pedestal 21 of the caster 20 is fitted, a notch for allowing the pedestal 21 to be fitted into the pair of pedestal fitting portions 11a1 and 11a2 is formed. As long as the pedestal 21 of the caster 20 can be fitted into the pair of pedestal insertion portions 11 a 1 and 11 a 2, the side surface of the main body 11 on the side where the pedestal 21 of the caster 20 is fitted may not be formed. Further, the shape and size of the notch are not limited to the example of FIG. 3, and any shape and size may be used.

  Furthermore, a pair of openings 11e1 and 11e2 are formed at positions corresponding to the pair of base insertion portions 11a1 and 11a2 in the main body 11, and the base 21 of the caster 20 is attached to the pair of base insertion portions 11a1 and 11a2. Whether the end 21c of the side of the tip 21 in the insertion direction of the pedestal 21 of the caster 20 is in contact with the first pedestal abutting portion 11b or not in the state in which the main body 11 is directed upward. A caster attach / detacher can also visually confirm from the upper surface side.

  The pedestal mounting state fixing / releasing member 11c is attached to the main body 11 so as to be movable in the vertical direction. The pedestal mounting state fixing / releasing member 11c is fitted into the pair of pedestal insertion portions 11a1 and 11a2 and is inserted into the first pedestal contact portion 11b. When the lower surface of the main body 11 of the carriage 10 faces downward with respect to the pedestal 21 of the caster 20 with which the end 21c of the side is in contact, the pedestal of the caster 20 from the front side in the insertion direction of the pedestal 21 of the caster 20 When the lower surface of the main body 11 of the carriage 10 faces upward, the casters from the front side in the insertion direction of the pedestal 21 of the casters 20 are moved to a position where the movement in the direction opposite to the insertion direction of the carriage 21 is restricted. It is comprised so that it may move to the position which cancels | releases the restriction | limiting of the movement to the direction opposite to the insertion direction of the 20 base 21. FIG.

Specifically, the base mounting state fixing / releasing member 11c includes a loose fitting portion 11c1, a first main body portion contact portion 11c2, a second main body portion contact portion 11c3, and a second base contact portion 11c4. Have.
The loose fitting portion 11c1 is formed in a rod shape, and is loosely fitted in a through portion 11d penetrating a cylindrical portion 11f provided downward from the upper surface of the main body portion 11 of the carriage 10.
The first main body contact portion 11c2 is provided at one end of the loose fitting portion 11c1, and is provided in the main body 11 of the carriage 10 when the lower surface of the main body 11 of the carriage 10 faces downward. was cylindrical portion enters the groove 11f _1, which is formed on the upper surface of 11f, it is constituted by a flange abutting the flange shape on the bottom of the groove 11f _1.
The second main body abutting portion 11c3 is configured by a main body side surface of a cylindrical portion provided on the other end side of the first main body abutting portion 11c2 in the loose fitting portion 11c1. of when the underside of the main body portion 11 is in a state facing upward, so as to abut against the lower surface 11f ₂ of the cylindrical portion 11f provided in the main body portion 11 of the carriage 10.
The 2nd base contact part 11c4 is comprised by the side surface in the said cylindrical part. The second pedestal contact portion 11c4 is fitted into the pair of pedestal insertion portions 11a1 and 11a2 when the lower surface of the main body portion 11 of the carriage 10 faces downward, and the first pedestal abutment The end 21c of the side at the front end in the insertion direction comes into contact with the contact portion 11b and is close to the end 21d on the front side in the insertion direction of the base 21 of the caster 20. Further, the second pedestal contact portion 11c4 contacts the end portion 21d of the side of the caster 20 on the near side in the insertion direction when the lower surface of the main body portion 11 of the carriage 10 faces upward. Retreat to a position where it will not.

The attaching / detaching operation of the caster 20 with the base to the main body 11 of the carriage 10 having the caster attaching / detaching structure of the first embodiment configured as described above will be described with reference to FIG.
When the caster 20 with the base is attached to the main body 11 of the carriage 10, first, the main body 11 (see FIG. 4A) with the lower surface facing downward is turned over so that the lower surface faces upward. (See FIG. 4 (b)). At this time, loosely fitting portion 11c1 which is loosely fitted into the through portion 11d is moved by gravity, to the lower surface 11f ₂ of the second body portion abutting portion 11c3 is cylindrical portion 11f provided in the main body portion 11 of the carriage 10 While abutting, the second pedestal abutting portion 11c4 retreats to a position where it does not abut on the end 21d of the side of the caster 20 on the near side in the insertion direction.
Next, the pedestal 21 of the caster 20 is fitted into the pair of pedestal insertion portions 11a1 and 11a2, and the end portion 21c at the end of the insertion direction is brought into contact with the first pedestal contact portion 11b (see FIG. 4C). .
Next, the main body 11 of the carriage 10 is turned over so that the lower surface faces downward (see FIG. 4 (d)). At this time, the loosely fitting portion 11c1 loosely fitted in the through portion 11d moves according to gravity, and the first main body portion contact portion 11c2 is formed on the upper surface of the cylindrical portion 11f provided in the main body portion 11 of the carriage 10. and enters into the groove 11f _1, with contacts the bottom surface of the groove 11f _1, second seat abutment portion 11c4 is close to the end portion 21d of the fitting direction front side of the sides of the base 21 of the caster 20. Thereby, the movement to the direction opposite to the insertion direction in the base 21 of the caster 20 is controlled, and mounting | wearing to the main-body part 11 of the cart 10 of the caster 20 with a base is completed. Whether the end 21c of the side of the tip of the caster 20 in the insertion direction is in contact with the first base contact part 11b is determined when the lower surface of the main body part 11 faces upward (FIG. 4). (c)), the caster can be visually confirmed from above the main body 11 and the lower surface of the main body 11 faces downward (see FIG. 4 (d)). The caster can be visually confirmed from above the main body 11 through the pair of openings 11e1 and 11e2.

When removing the caster 20 with the pedestal from the main body 11 of the carriage 10, first, the main body 11 (see FIG. 4 (d)) of the cart 10 with the caster 20 with the pedestal attached and the lower surface facing downward. Then, turn it over so that its lower surface faces upward (see FIG. 4 (c)). At this time, loosely fitting portion 11c1 which is loosely fitted into the through portion 11d is moved by gravity, to the lower surface 11f ₂ of the second body portion abutting portion 11c3 is cylindrical portion 11f provided in the main body portion 11 of the carriage 10 While abutting, the second pedestal abutting portion 11c4 retreats to a position where it does not abut on the end 21d of the side of the caster 20 on the near side in the insertion direction.
Next, the base 21 of the caster 20 is extracted from the pair of base insertion portions 11a1 and 11a2 (see FIG. 4B). Thereby, the removal from the main-body part 11 of the trolley | bogie 10 of the caster 20 with a base is completed.

According to the caster attachment / detachment structure of the first embodiment, a pair of pedestal insertion portions 11a1 and 11a2 that are provided on the lower surface of the main body portion 11 of the carriage 10 and that can be fitted with two end portions of the pedestal 21 of the caster 20, and the main body Since the first pedestal abutting portion 11b is provided on the lower surface of the portion 11 and comes into contact with the end portion 21c of the side of the tip of the caster 20 fitted in the pedestal fitting portions 11a1 and 11a2 in the fitting direction, a bolt or the like The caster with a pedestal can be easily attached to and detached from the main body of the carriage without using.
In addition, according to the caster attaching / detaching structure of the first embodiment, the caster 10 is attached to the main body 11 of the carriage 10 so as to be movable according to gravity in the vertical direction so as not to be detached from the main body 11 by moving in the vertical direction. The main body portion 11 of the carriage 10 with respect to the pedestal 21 of the caster 20 that is fitted into the insertion portion pedestal insertion portions 11a1 and 11a2 and the end portion 21c at the side of the insertion direction front end is in contact with the first pedestal contact portion 11b. When the lower surface of the caster 20 is directed downward, it moves according to gravity to a position that restricts the movement of the caster 20 in the direction opposite to the insertion direction of the pedestal 21 from the front side of the pedestal 21 in the pedestal 21 according to gravity. When the lower surface of the main body portion 11 is facing upward, the insertion direction of the pedestal 21 of the caster 20 from the front side of the pedestal 21 of the caster 20 is opposite to the insertion direction of the pedestal 21 of the caster 20 Since having a pedestal mounted state fixing and releasing member 11c which moves by gravity to a position for releasing the restriction of movement to the direction, caster detachable person, as caster detachable structure described in prior patent documents 1 to 3 In addition, when the caster is attached to or detached from the main body of the carriage, it is not necessary to attach or remove the restriction member for restricting the movement of the base attached to the main body of the carriage in the pull-out direction. .
Moreover, according to the caster attaching / detaching structure of the first embodiment, the pedestal mounting state fixing / releasing member 11c is movable in accordance with gravity in the vertical direction with respect to the main body 11 of the carriage 10 and detached from the main body 11 by moving in the vertical direction. Since the structure is attached so as not to be removed, when the caster is removed from the main body of the carriage, such as the restriction member provided in the caster attaching / detaching structure described in Patent Documents 1 to 3, the main body of the carriage is removed. Thus, since the main body of the carriage does not become a separate body, a caster detacher does not need to pay attention not to lose the regulating member.
As a result, according to the caster attaching / detaching structure of the first embodiment, it is not necessary to attach and remove the restricting member for restricting the movement of the pedestal attached to the main body of the cart in the pull-out direction to the main body of the cart. In addition, it is possible to simplify the attaching / detaching operation of the caster base with respect to the main body of the carriage as much as possible.

  Further, the caster attaching / detaching structure of the first embodiment has a cylindrical portion on the other end side of the first body portion abutting portion 11c2 in the loosely fitting portion 11c1, and the second body portion abutting portion 11c3 is replaced with the cylindrical portion. Since the second pedestal abutting portion 11c4 is constituted by the side surface of the cylindrical portion, the pedestal mounting state fixing / releasing member 11c can be miniaturized, and the space for attaching / detaching the trolley to the main body portion is provided. Can be suppressed.

Second Embodiment FIG. 5 is a view showing a configuration of a main part of a main body of a cart provided with a caster attaching / detaching structure according to a second embodiment of the present invention. FIG. , (B) is a diagram showing a partial cross section of the main part in (a), (c) is a bottom view near the main part of the main body of the carriage, (d) is a top view near the main part of the main body of the truck. It is. FIG. 6 is an explanatory view showing a procedure for attaching a caster with a pedestal to a cart equipped with a caster attaching / detaching structure of the second embodiment and an operating state of a main part of the caster attaching / detaching structure. The figure which shows the initial state where the casters with pedestals are not installed, (b) is the figure which shows the state where the top and bottom of the main body of the carriage is inverted from the state of (a), (c) is the state of (b) (D) is a diagram showing a state in which the top and bottom of the main body of the cart in the state of (c) are returned to the original state. In addition, about the component similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

In the caster attaching / detaching structure of the second embodiment, the pair of pedestal insertion portions 11 a 1 and 11 a 2 are provided on the lower surface of the main body portion 11, and the opposite end portions 21 a and 21 b of the pedestal 21 of the caster 20 can be inserted. In addition, the cross section extending in the insertion direction is constituted by a substantially L-shaped groove and a groove having a shape in which the upper and lower sides of the substantially U-shape are turned upside down.
Further, as shown in FIG. 5 (d), the pair of pedestal insertion portions 11a1 and 11a2 are formed on the lower side of the groove that has a substantially U-shaped cross section and a substantially U-shaped groove. The plate-like portion and the first pedestal contact portion 11b are formed so as to be separated from each other by a predetermined distance L1, and when the pedestal 21 of the caster 20 is fitted into the pair of pedestal insertion portions 11a1 and 11a2. The end portion 21c of the tip of the caster 20 on the pedestal 21 in the insertion direction is in contact with the first pedestal abutting portion 11b in a state of being directed upward through the pair of openings 11e1 and 11e2. A person who attaches / detaches the caster can visually confirm from the upper surface side of the main body 11.
The loose fitting portion 11 c 1 is formed in a rod shape and is loosely fitted in a through portion 11 d that penetrates the main body portion 11 of the carriage 10.
Further, the first main body portion contact portion 11c2 is provided at one end of the loosely fitting portion 11c1, and when the lower surface of the main body portion 11 of the carriage 10 faces downward, the main body portion 11 of the carriage 10 is provided. It is comprised by the flange of a bowl shape contact | abutted to.
In addition, the second main body contact portion 11c3 is provided on the other end side of the first main body contact portion 11c2 in the loose fitting portion 11c1, and the lower surface of the main body portion 11 of the carriage 10 faces upward. It is comprised by the flange | flange of the flange shape which contact | abuts to the lower surface of the main-body part 11 of the trolley | bogie 10 when it exists in the state.
Moreover, the 2nd base contact part 11c4 is formed in the rod shape, and is connected to the loose fitting part 11c1.
Other configurations are substantially the same as the caster attaching / detaching structure of the first embodiment.

The attaching / detaching operation of the caster 20 with the base to the main body 11 of the carriage 10 having the caster attaching / detaching structure of the second embodiment configured as described above will be described with reference to FIG.
When the caster 20 with the base is attached to the main body 11 of the carriage 10, first, the main body 11 (see FIG. 6A) with the lower surface facing downward is turned over so that the lower surface faces upward. (See FIG. 6 (b)). At this time, the loosely fitting portion 11c1 loosely fitted into the through-hole 11d moves according to gravity, the second main body portion abutting portion 11c3 abuts on the lower surface of the main body portion 11 of the carriage 10, and the second pedestal abutting The part 11c4 retracts to a position where it does not contact the end part 21d of the side on the near side in the insertion direction of the base 21 of the caster 20.
Next, the pedestal 21 of the caster 20 is fitted into the pair of pedestal insertion portions 11a1 and 11a2, and the end portion 21c at the end of the insertion direction is brought into contact with the first pedestal contact portion 11b (see FIG. 6C). .
Next, the main body 11 of the carriage 10 is turned over so that the lower surface faces downward (see FIG. 6D). At this time, the loosely fitting portion 11c1 loosely fitted in the through portion 11d moves according to gravity, the first main body portion contact portion 11c2 contacts the upper surface of the main body portion 11 of the carriage 10, and the second pedestal contact portion. The portion 11c4 is close to the end portion 21d of the side on the near side in the insertion direction of the base 21 of the caster 20. Thereby, the movement to the direction opposite to the insertion direction in the base 21 of the caster 20 is controlled, and mounting | wearing to the main-body part 11 of the cart 10 of the caster 20 with a base is completed. Whether or not the end portion 21c at the front end of the caster 20 in the insertion direction is in contact with the first base contact portion 11b is determined when the lower surface of the main body portion 11 faces upward (FIG. 6). (c)), the caster can be visually confirmed from above the main body 11 and the lower surface of the main body 11 faces downward (see FIG. 6 (d)). The caster can be visually confirmed from above the main body 11 through the pair of openings 11e1 and 11e2.

When removing the caster 20 with the pedestal from the main body 11 of the carriage 10, first, the main body 11 (see FIG. 6 (d)) of the cart 10 with the caster 20 with the pedestal attached and the bottom surface facing downward. Then, turn it over so that its lower surface faces upward (see FIG. 6 (c)). At this time, the loosely fitting portion 11c1 loosely fitted into the through-hole 11d moves according to gravity, the second main body portion abutting portion 11c3 abuts on the lower surface of the main body portion 11 of the carriage 10, and the second pedestal abutting The part 11c4 retracts to a position where it does not contact the end part 21d of the side on the near side in the insertion direction of the base 21 of the caster 20.
Next, the base 21 of the caster 20 is extracted from the pair of base insertion portions 11a1 and 11a2 (see FIG. 6B). Thereby, the removal from the main-body part 11 of the trolley | bogie 10 of the caster 20 with a base is completed.

  As with the caster attachment / detachment structure of the first embodiment, the main body portion of the carriage of the carriage is also a restriction member for restricting the movement of the pedestal attached to the main body portion of the carriage in the pull-out direction. No need to attach or remove to the main body of the cart, the caster base can be easily attached and detached as much as possible, and the base mounting state fixing / release member can be miniaturized, and the space for attaching to the main body of the cart can be reduced. be able to.

Third Embodiment FIG. 7 is a diagram showing a configuration of a main part of a cart provided with a caster attaching / detaching structure according to a third embodiment of the present invention. FIG. ) Is a diagram showing a partial cross section of the main part in (a), (c) is a bottom view in the vicinity of the main part of the main body of the carriage, and (dc) is a top view in the vicinity of the main part of the main body of the truck. FIG. 8 is an explanatory view showing a procedure for attaching a caster with a pedestal to a cart equipped with a caster attaching / detaching structure of the third embodiment and an operating state of a main part of the caster attaching / detaching structure. The figure which shows the initial state where the casters with pedestals are not installed, (b) is the figure which shows the state where the top and bottom of the main body of the carriage is inverted from the state of (a), (c) is the state of (b) (D) is a diagram showing a state in which the top and bottom of the main body of the cart in the state of (c) are returned to the original state. In addition, about the component similar to 2nd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

In the caster attaching / detaching structure of the third embodiment, the configuration of the base mounting state fixing / releasing member 11c ′ is different from the base mounting state fixing / releasing member 11c in the caster attaching / detaching structure of the cart of the second embodiment.
Specifically, the second base contact portion 11c4 ′ and the loose fitting portion 11c1 ′ constituting the base mounting state fixing / releasing member 11c ′ are each formed in a plate shape.
The second main body contact portion 11c3 ′ and the first main body contact portion 11c2 ′ are elongated rectangular shapes that cover the end surfaces of the second pedestal contact portion 11c4 ′ and the loose fitting portion 11c1 ′, respectively. Is formed.
And penetration part 11d 'formed in the main-body part 11 is formed so that it may have the plate-shaped space which loosely fits loosely fitting part 11c1'.
Other configurations are substantially the same as the caster attaching / detaching structure of the second embodiment.

According to the caster attaching / detaching structure of the third embodiment, the second pedestal abutting portion 11c4 ′ abuts over a wide range at the end portion 21d on the front side in the insertion direction of the pedestal 21 attached to the main body portion 11 of the carriage 10. Therefore, the movement of the pedestal attached to the main body of the carriage in the pull-out direction can be more reliably regulated.
Other functions and effects are substantially the same as those of the caster attaching / detaching structure of the second embodiment.

As mentioned above, although embodiment of this invention was described, the caster attachment / detachment structure of this invention and a trolley | bogie provided with it are not limited to the structure of said each embodiment.
For example, in the example of FIGS. 1 to 4, the caster attaching / detaching structure of the first embodiment is such that the pedestal mounting state fixing / releasing member 11 c is in contact with the intermediate position of the longitudinal side of the pedestal 21 of the caster 20. However, a plurality of pedestal mounting state fixing / releasing members 11c may be provided so as to come into contact with a position symmetrical with respect to an intermediate position of the side of the caster 20 in the longitudinal direction.

  In addition, in the caster attaching / detaching structure of each embodiment, each part forming the bottom surface of the groove in the vicinity of the end opposite to the base contact part 11b of the pair of base insert parts 11a1 and 11a2 is caster at the insertion start position. It is preferable to form a shape (for example, a taper shape or a curved surface shape) that has a space for loosely fitting 20 pedestals 21 and narrows so that the pedestal 21 is slidably contacted with the pedestal 21 as the pedestal 21 is fitted in the fitting direction. If it does in this way, since the base 21 of the caster 20 will be guide | induced to a fitting position by a pair of base insertion part 11a1, 11a2 by the said taper shape and curved surface shape, the base 21 of the caster 20 will be a pair of base insertion part 11a1, 11a2. It becomes easy to insert in, and insertion operation becomes still easier.

  The caster attaching / detaching structure of the present invention and the cart including the caster attaching / detaching structure are useful for carts in all fields in which it is necessary to replace casters with pedestals.

10 trolley 11 main body 11a1, 11a2 pedestal insertion portion 11a1 ₁ , 11a2 ₁ lower surface holding portion 11a0, 11a1 ₂ , 11a2 ₂ upper surface contact portion 11b first pedestal contact portion 11c, 11c ′ pedestal mounting state fixing / releasing member 11c1 11c1 ′ loose fitting portions 11c2, 11c2 ′ first main body contact portions 11c3, 11c3 ′ second main body contact portions 11c4, 11c4 ′ second pedestal contact portions 11d, 11d ′ penetrating portions 11e1, 11e2 Opening portion 11f Cylindrical portion 11f ₁ groove 11f ₂ lower surface 12 gripping portion 20 casters with pedestals 21 pedestals 21a and 21b two opposite end portions 21c on the pedestal end portions 21d on the pedestal end in the insertion direction front side in the insertion direction on the pedestal Side edge portion 22 Wheel 51 Loading platform 52 Frame portions 52a, 52b, 52c, 52d Side walls 53, 54 Bottom plate portion 55 Upper plate portion 5 Stopper 58a Side wall 58b Protruding part 58c Engaging convex part 59 Pressing piece 59a Side wall 59b Engaging convex part 60 Caster 61 Pedestal 61a One end 61b Other end 70 Dolly main body 71 Caster pedestal fixed support 72 Caster mounting part internal connection rib 73 Caster Pedestal mounting support block 73 'Fitting block portions 73a', 73b 'Side wall 73a1' Horizontal locking projection 73b1 'Locking projection 73 "Caster base support plate 74 Short side facing partition rib 74a Outer locking through hole 80 Caster 81 Pedestal 81a, 81b Side part 82 Fitting block mounting space part 90 Table 92 Clamping part 92a Support surface 92b Clamping surface 92c Rib 93 Stopper 93a Engagement protrusion 94 Insertion hole 100 Caster 101 Pedestal

Claims (6)

A caster attachment / detachment structure for attaching / detaching a caster with a pedestal to a main body of a carriage,
A pair of pedestal insertion portions provided on the lower surface of the main body portion and capable of inserting two side ends of the pedestal of the casters;
A first pedestal abutting portion that is provided on the lower surface of the main body portion and abuts with an end of a side of the tip in the fitting direction of the pedestal of the caster that is fitted into the pair of pedestal fitting portions;
It is attached to the main body part so as to be movable in accordance with gravity in the vertical direction and not detached from the main body part by moving in the vertical direction, and is fitted into the pair of pedestal insertion parts, and is in contact with the first pedestal When the lower surface of the main body of the cart is directed downward with respect to the base of the caster in which the end of the side of the tip in the insertion direction is in contact with the portion, the caster is inserted from the front side of the caster in the insertion direction. of the insertion direction of the pedestal moved by gravity to a position for restricting movement in the opposite direction, in a state in which the lower surface of the main body portion of the truck facing upward, from insertion direction front side of the pedestal of the caster A pedestal mounting state fixing / releasing member that moves according to gravity to a position that releases the restriction of movement in the direction opposite to the direction of insertion of the pedestal of the caster,
A caster attaching / detaching structure characterized by comprising: The base mounting state fixing / releasing member is:
A loosely fitted portion loosely fitted in a penetrating portion penetrating the main body portion of the carriage,
A first main body abutting portion that is provided at one end of the loosely fitting portion and that abuts the upper surface of the main body of the cart when the lower surface of the main body of the cart is facing downward;
The lower surface of the main body portion of the carriage is provided on the other end side of the first fitting portion of the loose fitting portion and the lower surface of the main body portion of the carriage faces upward. A second body portion abutting portion that abuts on
When it is connected to the loose fitting part and the bottom surface of the main body of the carriage is facing downward, it fits into the pair of pedestal fitting parts and fits into the first pedestal contact part The caster when the end of the side of the trolley is in contact with the end of the side of the caster base on the near side in the insertion direction and the bottom surface of the main body of the carriage is facing upward. A second pedestal contact portion that retreats to a position that does not contact the end of the side on the near side in the insertion direction of the pedestal,
The caster attaching / detaching structure according to claim 1, wherein the caster attaching / detaching structure is provided. It has a cylindrical part on the other end side than the first body part contact part in the loose fitting part,
The second main body portion abutting portion is composed of a surface of the cylindrical portion on the main body portion side,
The caster attaching / detaching structure according to claim 2, wherein the second pedestal abutting portion includes a side surface of the cylindrical portion.   The caster attachment / detachment structure according to claim 2, wherein the second base contact portion is formed in a bar shape.   The caster attachment / detachment structure according to claim 2, wherein the second base contact portion is formed in a plate shape.   The cart provided with the caster attachment / detachment structure in any one of Claims 1-5.

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